CN105879175A - Control method for tidal volume of anaesthesia machine - Google Patents

Control method for tidal volume of anaesthesia machine Download PDF

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Publication number
CN105879175A
CN105879175A CN201410784894.8A CN201410784894A CN105879175A CN 105879175 A CN105879175 A CN 105879175A CN 201410784894 A CN201410784894 A CN 201410784894A CN 105879175 A CN105879175 A CN 105879175A
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China
Prior art keywords
tidal volume
patient
capacity
control
volume
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Pending
Application number
CN201410784894.8A
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Chinese (zh)
Inventor
刁俊
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Beijing Aerospace Changfeng Co Ltd
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Beijing Aerospace Changfeng Co Ltd
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Application filed by Beijing Aerospace Changfeng Co Ltd filed Critical Beijing Aerospace Changfeng Co Ltd
Priority to CN201410784894.8A priority Critical patent/CN105879175A/en
Publication of CN105879175A publication Critical patent/CN105879175A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a control method for the tidal volume of an anaesthesia machine. The control method comprises the steps that the anaesthesia machine is started, pipeline compliance self-inspection is conducted on a systematic connecting pipeline of the anaesthesia machine and a breathing machine, the pipeline volume at the t moment is calculated according to a self-inspection result, and the instantaneous patient inhalation volume is calculated according to the pipeline volume at the t moment; a calculated instantaneous patient inhalation volume value is compared with a preset tidal volume value to judge whether the calculated instantaneous patient inhalation volume value reaches the preset tidal volume value or not, and if not, air is continuously supplied; if the calculated instantaneous patient inhalation volume value reaches or exceeds the preset tidal volume value, the state is switched into a breath holding control state to wait that inspiration is finished and the expiration switching time arrives, and meanwhile the exceeding part is released; after inspiration is finished, the expiration tidal volume is monitored, a difference value between the expiration tidal volume and the preset tidal volume is calculated, the part which is smaller than the preset tidal volume is compensated through feedback, and the part which exceeds the preset tidal volume is not weakened.

Description

A kind of control method of anesthesia apparatus tidal volume
Technical field
The present invention relates to the control method of a kind of anesthesia apparatus tidal volume, be used for promoting under anesthetic machine and respirator volume control disease People sucks tidal volume degree of accuracy, improves the safety under capacity ventilation, belongs to armarium manufacturing technology field.
Background technology
In anesthetic machine and respirator control, volume control is generally using anti-as this tidal volume of the monitoring tidal volume in previous cycle Feedback controls parameter, and substitution system carries out feedback control, utilizes formula VT=Δ V* (C-Ctube)/C, calculates patient's tidal volume, Wherein Δ V tidal volume change, patient VT sucks tidal volume, C system entirety compliance, Ctube circuit compliance.To calculate The VT obtained brings formula VT '=VT+ Δ VT*K into, calculates tidal volume deviation and feedback is controlled, under wherein VT ' is Cycle should reach tidal volume, and Δ VT is to preset tidal volume to deduct the difference of patient's tidal volume.This kind of method easily produces concussion, and And there will be tidal volume over control.
Summary of the invention
It is an object of the invention to provide a kind of method that can guarantee that in anesthetic machine and respirator control, tidal volume control is stable, reduce Because of the excessive injury to human body of tidal volume during regulation.
The control method of a kind of anesthesia apparatus tidal volume, it is characterised in that comprise the steps:
(1) utilize RC fast estimation technique, start that anesthetic machine and respirator connecting line are carried out circuit compliance Ctube Carry out self-inspection;
(2) calculate t circuit capacity Vtube (t) according to the circuit compliance Ctube of self-inspection, calculate and use below equation:
Vtube (t)=P (t)-P (t-1) * Ctube,
Wherein P (t) is the patient end pressure that t monitors, and P (t-1) is patient end previous moment pressure;
(3) t circuit capacity Vtube (t) calculated according to step (2), monitors and calculates t patient's wink in real time Time inlet capacity Vt (t), calculate use below equation:
Vt (t)=Vs (t)-Vtube (t),
Wherein Vs (t) is t anesthetic machine and respirator system output capacity;
(4) when the Vt (t) monitored is more than or equal to when setting tidal volume VTset, control system is switched into controlled state of holding one's breath, Wait that switching time of exhaling arrives, utilize suction control valve and exhalation control valve collaboration working method in controlled state of holding one's breath simultaneously, To discharge more than the capacity of VTset part;
(5) inspiratory duration is by rear monitoring exhalation flow rate and system expiration tidal volume Vs, and calculates patient and exhale tidal volume VT, calculates and uses equation below:
VT=Vs-(Ppeak-PEEP) * Ctube,
Wherein Vs is system monitoring expiration tidal volume, and Ppeak is patient's inspiration peak pressure, and PEEP is patient's end expiratory positive pressure;
(6) formula Δ VT=VTset-VT is utilized to calculate the difference that patient exhales tidal volume VT and sets tidal volume VTset, Compensated less than the part setting tidal volume by feedback, do not weaken for exceeding the part setting tidal volume.
The present invention is to utilize the patient's inlet capacity and circuit compliance parameter real-time monitored, it is achieved the accurate control to tidal volume System, improves tidal volume control accuracy, reduces the generation of tidal volume regulation over control.
Accompanying drawing explanation
Fig. 1 is the flowchart of the present invention
Detailed description of the invention
Below in conjunction with the flowchart of the invention shown in accompanying drawing 1, the detailed description of the invention of the present invention is illustrated.
As shown in Figure 1, the realization approach that the present invention is total is:
Preset and allow tidal volume;During capacity ensures control, first start shooting to anesthetic machine and respirator system connecting line Carrying out circuit compliance self-inspection, calculating t according to self-detection result is circuit capacity, is that circuit capacity calculates according to t Go out instantaneous patient's inlet capacity;The instantaneous patient's inlet capacity value calculated is contrasted with default tidal volume values, sees and whether reach pre- If tidal volume, if not up to, continue supply;If meeting or exceeding, then switching to controlled state of holding one's breath, waiting that air-breathing terminates, Exhale and arrive switching time, overage is discharged simultaneously;After air-breathing terminates, monitor expiration tidal volume, and calculate expiration Tidal volume and the difference setting tidal volume, compensated less than the part setting tidal volume by feedback, for exceeding setting tide The part of tolerance does not weakens.
Concrete methods of realizing of the present invention is as follows:
(1) utilize RC fast estimation technique, start that anesthetic machine and respirator connecting line are carried out circuit compliance Ctube Carry out self-inspection;
(2) calculate t circuit capacity Vtube (t) according to the circuit compliance Ctube of self-inspection, calculate and use below equation:
Vtube (t)=P (t)-P (t-1) * Ctube,
Wherein P (t) is the patient end pressure that t monitors, and P (t-1) is patient end previous moment pressure;
(3) t circuit capacity Vtube (t) calculated according to step (2), monitors and calculates t patient's wink in real time Time inlet capacity Vt (t), calculate use below equation:
Vt (t)=Vs (t)-Vtube (t),
Wherein Vs (t) is t anesthetic machine and respirator system output capacity;
(4) when the Vt (t) monitored is more than or equal to when setting tidal volume VTset, control system is switched into controlled state of holding one's breath, Wait that switching time of exhaling arrives, utilize suction control valve and exhalation control valve collaboration working method in controlled state of holding one's breath simultaneously, To discharge more than the capacity of VTset part;
(5) inspiratory duration is by rear monitoring exhalation flow rate and system expiration tidal volume Vs, and calculates patient and exhale tidal volume VT, calculates and uses equation below:
VT=Vs-(Ppeak-PEEP) * Ctube,
Wherein Vs is system monitoring expiration tidal volume, and Ppeak is patient's inspiration peak pressure, and PEEP is patient's end expiratory positive pressure;
(6) formula Δ VT=VTset-VT is utilized to calculate the difference that patient exhales tidal volume VT and sets tidal volume VTset, Compensated less than the part setting tidal volume by feedback, do not weaken for exceeding the part setting tidal volume.
In above-mentioned steps (4), to the capacity more than VTset part according to the policy setting release time of slowly release, discharge Time range is 1ms~500ms, regulates release time according to machine system corresponding speed.
In above-mentioned steps (4), utilize volume change to inlet valve and outlet valve according to QI invigorating and the principle of release in the stage of holding one's breath Capacity is carried out flow PID regulation.

Claims (3)

1. the control method of an anesthesia apparatus tidal volume, it is characterised in that comprise the steps:
(1) utilize RC fast estimation technique, start that anesthetic machine and respirator connecting line are carried out circuit compliance Ctube Carry out self-inspection;
(2) calculate t circuit capacity Vtube (t) according to the circuit compliance Ctube of self-inspection, calculate and use below equation:
Vtube (t)=P (t)-P (t-1) * Ctube,
Wherein P (t) is the patient end pressure that t monitors, and P (t-1) is patient end previous moment pressure;
(3) t circuit capacity Vtube (t) calculated according to step (2), monitors and calculates t patient's wink in real time Time inlet capacity Vt (t), calculate use below equation:
Vt (t)=Vs (t)-Vtube (t),
Wherein Vs (t) is t anesthetic machine and respirator system output capacity;
(4) when the Vt (t) monitored is more than or equal to when setting tidal volume VTset, control system is switched into controlled state of holding one's breath, Wait that switching time of exhaling arrives, utilize suction control valve and exhalation control valve collaboration working method in controlled state of holding one's breath simultaneously, To discharge more than the capacity of VTset part;
(5) inspiratory duration is by rear monitoring exhalation flow rate and system expiration tidal volume Vs, and calculates patient and exhale tidal volume VT, calculates and uses equation below:
VT=Vs-(Ppeak-PEEP) * Ctube,
Wherein Vs is system monitoring expiration tidal volume, and Ppeak is patient's inspiration peak pressure, and PEEP is patient's end expiratory positive pressure;
(6) formula Δ VT=VTset-VT is utilized to calculate the difference that patient exhales tidal volume VT and sets tidal volume VTset, Compensated less than the part setting tidal volume by feedback, do not weaken for exceeding the part setting tidal volume.
The control method of a kind of anesthesia apparatus tidal volume the most according to claim 1, it is characterised in that: described step (4) In, to the capacity more than VTset part according to the policy setting release time slowly discharged, release time, scope was 1ms~500ms, regulates release time according to machine system corresponding speed.
The control method of a kind of anesthesia apparatus tidal volume the most according to claim 2, it is characterised in that: in stage profit of holding one's breath By volume change, inlet valve and outlet valve are carried out flow PID regulation according to the principle of QI invigorating and release to capacity.
CN201410784894.8A 2014-12-16 2014-12-16 Control method for tidal volume of anaesthesia machine Pending CN105879175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410784894.8A CN105879175A (en) 2014-12-16 2014-12-16 Control method for tidal volume of anaesthesia machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410784894.8A CN105879175A (en) 2014-12-16 2014-12-16 Control method for tidal volume of anaesthesia machine

Publications (1)

Publication Number Publication Date
CN105879175A true CN105879175A (en) 2016-08-24

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CN201410784894.8A Pending CN105879175A (en) 2014-12-16 2014-12-16 Control method for tidal volume of anaesthesia machine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110141740A (en) * 2019-05-20 2019-08-20 上海交通大学医学院附属新华医院 A kind of portable intelligent net formula atomizer with pulmonary function test (pft) system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110141740A (en) * 2019-05-20 2019-08-20 上海交通大学医学院附属新华医院 A kind of portable intelligent net formula atomizer with pulmonary function test (pft) system

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Application publication date: 20160824

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